Blue Mailing Bags 12×16" (305×406 mm) – Premium Strong Self-Seal Postal Bags for E-commerce Shipping
Blue Mailing Bags 12×16" (305×406 mm) – Premium Strong Self-Seal Postal Bags for E-commerce Shipping
Blue Mailing Bags 12×16" (305×406 mm) made from 60 µm, 100% recycled LDPE (code 4). These self-seal postal bags are moisture-proof / water-resistant, fully opaque for privacy and built for daily e-commerce dispatch. Trusted by UK online sellers on eBay, Amazon, Etsy and Shopify, with bulk discounts available.
Not the size you need? See all sizes.
Strong 60 µm Eco Postal Bags – Blue 12×16"
Durable co-extruded 60 µm film helps resist tears and punctures. The permanent peel-and-seal closure saves time and tape, while the opaque blue finish gives a neat, branded look at the doorstep.
Why this 12×16" size?
12×16" is the sweet spot for hoodies, jeans and small boxed items. It offers more depth than 10×14" without the bulk of 15×18", helping you control postage bands and reduce void space. The blue colour adds a clean brand presence without custom print costs.
Real use examples
- Hoodies, jeans and joggers
- Books and stationery sets
- Beauty gift boxes and refill kits
- Small electronics and accessories
Fit & packing guidance
Best for contents up to approx. 285×380×60 mm. If tight, step up to 15×18"; if there’s spare space, step down to 10×14". Pad sharp inner-box corners and press out air for flatter parcels and lower volume.
Key benefits
- Strong self-seal – permanent, tamper-evident bond
- 60 µm recycled LDPE – tear/puncture resistance
- Moisture-proof / water-resistant outer
- Opaque blue – privacy and brand presence
- Lightweight – helps reduce courier/Royal Mail costs
- Recyclable LDPE (code 4) – return-to-store schemes
Eco & Materials
Made from 100% recycled LDPE to reduce virgin plastic use. Not biodegradable or compostable. Recycle through soft-plastic return schemes (remove the glue strip).
Strength & Protection
Co-extruded film for toughness, tamper-evident adhesive for security, and a fully opaque finish for customer privacy.
Storage & Performance
Store flat between 13–21 °C and away from direct heat/sunlight. Allow cold stock to acclimatise before sealing for optimal adhesion.
Lightweight = Lower Postage
Mailing bags weigh less than cartons, keeping parcels within lower weight bands while protecting soft goods and light boxes.
Size comparison
| Option | Size (in + mm) | Typical fit |
|---|---|---|
| Step down | 10×14" (254×355 mm) | T-shirts, books, accessories |
| This page | 12×16" (305×406 mm) | Hoodies, jeans, small boxes |
| Step up | 15×18" (381×457 mm) | Jackets, multi-item bundles |
Packing tips
- Fold garments to minimise depth
- Press out air before sealing
- Pad inner-box corners
- Use a document wallet for labels/paperwork
Related sizes & essentials
Same colour sizes: 10×14" • 15×18" • 17×22"
Essentials: Mailing Bags • Document Wallets • Packaging Tape • Cardboard Boxes
Order today for fast UK delivery and bulk savings on daily dispatches.
| Material | LDPE (code 4) |
| Size | 12x16 Inch (305x406 mm) |
| Color | Blue |
| Closure | Peel-and-Seal (Permanent) |
| Recyclability | Return to Supermarket Soft-Plastic Points |
| Thickness | 60 µm |
| Water Protection | Water-Resistant |
What can I fit in a 12×16" blue mailing bag?
Will a 12×16" mailing bag split if I pack thicker clothing?
Why choose a blue 12×16" mailing bag instead of plain grey?
Do these 12×16" bags have a self-seal strip?
Are these blue 12×16" mailing bags water-resistant?
Are the 12×16" blue mailing bags recyclable and eco-friendly?
Are these bags fully opaque for privacy and discretion?
Can I use the 12×16" blue mailing bag with Royal Mail and UK couriers?
How should I pick the right size: 12×16" vs 15×18"?
How should I store the 12×16" blue mailing bags so the seal stays strong?
Royal Mail 24 Tracked
Dispatched same day if ordered before 5 pm Monday to Friday. Please allow up to 1-2 days for delivery.
£1.99
DPD Next Day
Dispatched same day if ordered before 3 pm Monday to Thursday. Not available to Scottish Highlands & Islands.
£4.99
Free on orders over £100